- Take the reaction: NH3 + O2
NO + H2O. In an experiment, 3.25 g of NH3 are allowed
to react with 3.50 g of O2.
a. Which reactant is the limiting reagent? O2
b. How many grams of NO are formed? 2.63
g NO
c. How much of the excess reactant remains after the reaction? 1.76
g NH3 left
- If 4.95 g of ethylene (C2H4) are combusted with 3.25
g of oxygen.
a. What is the limiting reagent? O2
b. How many grams of CO2 are formed? 2.98
g CO2
- Consider the reaction of C6H6 + Br2
C6H5Br + HBr
a. What is the theoretical yield of C6H5Br if 42.1
g of C6H6 react with 73.0 g of Br2? 71.6
g C6H5Br
b. If the actual yield of C6H5Br is 63.6 g, what
is the percent yield? 88.8%
- Use the following reaction: C4H9OH + NaBr + H2SO4
C4H9Br
+ NaHSO4 + H2O If 15.0 g of C4H9OH
react with 22.4 g of NaBr and 32.7 g of H2SO4 to yield
17.1 g of C4H9Br, what is the percent yield of this
reaction?
61.6%
- Silicon nitride (Si3N4) is made by a combining Si
and nitrogen gas (N2) at a high temperature. How much (in g) Si
is needed to react with an excess of nitrogen gas to prepare 125 g of silicon
nitride if the percent yield of the reaction is 95.0%?
79.1 g Si
- Souring of wine occurs when ethanol is converted to acetic acid by oxygen
by the following reaction: C2H5OH + O2
CH3COOH + H2O. A 1.00 L bottle of wine, labeled as 8.5% (by volume)
ethanol, is found to have a defective seal. Analysis of 1.00 mL showed that
there were 0.0274 grams of acetic acid in that 1.00 mL. The density of ethanol
is 0.816 g/mL and the density of water is 1.00 g/mL.
a. What mass of oxygen must have leaked into the bottle? 14.6
g O2
b. What is the percent yield for the conversion of ethanol to acetic acid
if O2 is in excess? 30.3%
- A reaction container holds 5.77 g of P4 and 5.77 g of O2.The
following reaction occurs: P4 + O2
P4O6. If enough oxygen is available then the P4O6
reacts further: P4O6 + O2
P4O10.
a. What is the limiting reagent for the formation of P4O10? O2
b. What mass of P4O10 is produced? 5.78
g P4O10
c. What mass of excess reactant is left in the reaction container? 5.76
g P4O6 remain